At least where I live, the vast majority "ghost guns" that are getting used for crimes are polymer80 glocks that can be built with just a drill, no 3d printing required.
The majority of ghost gun crime arrests and charges that I’ve seen in various local and nationwide news articles are still polymer80 frames and 80% ar-type lowers, vs. printed frames. I’d estimate only about 10% or less involved printing but is creeping up with p80 taking heat and printing becoming more ubiquitous.